it is mounted on the top of the coolant outlet at the front of the head (the one that has the large top radiator hose attached to it). There are two sensors mounted there, one is the temp sensor for the emission controls, the other is the TVSV valve.

did someone remove it and put a plug in the hole? It will never run correctly without it. though it might be possible to by pass the function, it means it will run baulky when cold, after warm up it would run fine.

You can likely find a working TVSV and install it where it is supposed to be on that outlet fitting. make sure you get all of the vac lines routed properly.

Toyota pn is 90925-02076- they're on the I-net for $120- $140. A few years back, I came up with an alternative- a "hand choke" if you will. I'd post the link, but can't- too stupid. Just do a search on "gc switch" and it'll come up.

With @Petros guide, I could find the TVSV valve in my car. It located attached to the site where the shock absoebers lies. (coolent site).

So I could save around $120. But there is no power supply to it. Also the manifold vacuum line is disconnected. Vacuum output lines are also ended in a short distance. So this one was not functioning for some period.

Now the first problem I am having is that "From where the manifold vacuum is started to come to the TVSV ?". That means what is the position in the manifold where that TVSV is supplied. Second problem is " From where should I give the power supply to the TVSV and How much voltage should be given?."

I am afraid that the thing I found could be the VSV. If so please advice me. I want to know whether TVSV and the VSV have the same function?

If I need to post a separate question for this, please let me know.

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I see you have a RHD car- master cyl in the pic kinda threw me for awhile. Anyway, TVSV has NO electrical connections- just 5 vacuum ports (at least our US spec cars do.) As Petros said, it's mounted in the housing bolted to the cly head that the upper radiator hose connects to. Pretty sure what you're pointing to is the switch over valve that increases the engine idle speed when the AC is turned on. Maybe your spec car never had a TVSV?? I'm only familiar with the US stuff. Maybe some of the Canada guys can help out...

the item pictures in not the TVSV, it is a Vacuum Switching valve (SVS), NOT the same function. that one opens and closes the vac line based on when power is supplied to the switch.

the TVSV has more vac lines and is temperate controlled, not electrical, and it is mounted on the engine, not the strut tower.

This should be simple, I presume you can identify the engine (the big metal thing in the center of the engine compartment). At the front of the engine there is a fitting on the right side of the head (right side as seen from drivers position). From there, there is a large 10 cm (2.5" dia) black hose that goes to the top of the radiator. Where this hose attaches at the engine end, in that fitting on top, is a black plastic and brass fitting with about six small vac lines coming out of it. That is the TVSV. Note, this is NOT on the fender, nor the strut tower, it is at the front of the engine near the top right side.

Thanks @rer233 and @petros for your advice. It seems there is no TVSV in my car. This is a picture of the head of the engine. Carburetor was removed for repair. So the stuff could be visible clearly. There are some pugs on this. Are them the site for TVSV?

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yes, that is where it goes, but none of the tubing hoses and other plumbing is present either. What country are you in? or what is the country of origin of this Tercel? You may have never gotten any emissions equipment, as we did in North America and much of western Europe and Japan. You likely have a very different carburetor as well.

If your car is designed to run without it, than you do not need it. lucky you.

I live in Sri Lanka. Only few vehicles available in Sri Lanka (About 30). These were imported by the government for government plantation company managers. I got a one from such a person.

Running condition and also the body condition are superb. Even after 30 years, only few places were found with corrosion. There must be an anti-corrosive primer layer applied in these. Also the under-coating is also thick. Strut engineering is superb. It goes in a uneven ground with pits without any discomfort. Several times I carried Cement bags (about 10 bags of 50 Kg) in my car. It seems it doesn't sense the weight.

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@Petros Sorry. What did you mean by "short shift lever"? The Levers available are Gear and the Hand Brake. Previous user encountered a problem with gear box. Replacement gear box couldn't find and he replaced it with a rear wheel drive gear system. So 4wd drive doesn't work on this.

But all the parts are available (including the Ball Joint)for front wheel drive except the transmission system.

Can you please suggest a replacement transmission system (other Toyota vehicle) for this ?.

that would explain it: it is the gear shift lever, yours is much shorter than the normal one. unfortunately the transmission is unique to this model, no other cars have anything that will work, you have to find a used replacement from another 4wd Tercel (or a front wheel drive, but that means you no longer have 4wd).

they have not made this transmission since 1987, and all spare parts are long gone. I am actually surprised that someone made another transmission work in this car, the configuration is very atypical for either rear wheel drive or front wheel drive cars.